CN1318627C - Nonoriented electromagnetic steel sheet - Google Patents

Abstract

The present invention provides a non-oriented electrical steel sheet containing: 0-0.010% of C; at least one of Si and Al in a total amount of 0.03% to 0.5%, or more than 0.5% to 2.5%; 0.5% or less of Mn; 0.10% or more to 0.26% or less of P; 0.015% or less of S; and 0.010% or less of N, on a mass percentage basis, wherein the non-oriented electrical steel sheet has excellent dimensional accuracy during a punching step. When the Si content is low, the non-oriented electrical steel sheet has the excellent balance between high magnetic flux density and low core loss. When the Si content is medium or high, the non-oriented electrical steel sheet has the excellent balance between high magnetic flux density and high strength.

Description

Non-oriented electromagnetic steel sheet having and manufacture method thereof

Technical field

The present invention relates to a kind of non-oriented electromagnetic steel sheet having that is used as the core material of electrical equipment.Especially, relate to demanding die-cut dimensional precision simultaneously and high magnetic flux density, be fit to do magnetic resistance motor or and then the non-oriented electromagnetic steel sheet having of the blank unshakable in one's determination of the DC brushless motor of the embedded magnetictype of desired strength etc. with and manufacture method.

Background technology

Non-oriented electromagnetic steel sheet having is the soft magnetic material that mainly is used as the core material of electrical equipment such as electric motor and transformer.Be improved efficiency and the miniaturization that realizes these electrical equipment, require the iron loss low magnetic flux density height of electro-magnetic steel plate.In the territory of electro-motor, the improvement of the magnetic of the electro-magnetic steel plate of blank unshakable in one's determination, promptly advance low iron loss, high magnetic flux densityization, and electric motor self is also by the AC induction motor of in the past non-synchronous type, advance rapidly more high efficiency syncmotor displacement, carry out high performance.

Syncmotor, general, be divided into surperficial magnetictype (SPM) and embed the DC brushless motor of magnetictype (IPM) and the classes such as magnetic resistance motor of the reluctance torque that produces according to the salience(-cy) of the magnetic of rotor and stator.When wherein being magnetic resistance motor, the generation of torque amount depends on the shape of rotor and stator and the magneticflux-density of gap between rotor/stator and blank.Therefore, be used for the blank unshakable in one's determination of magnetic resistance motor, when requiring high magnetic with density, die-cut size has high precision, and is more even more important than other electric motor.

And then, along with the progress of frequency conversionization,, the tendency that increases number of poles is arranged in the time of high speed rotatingization for improving motor efficiency and torque etc.These all are the key elements that improves operating frequency, so for non-oriented electromagnetic steel sheet having as the electric motor blank, (50～60Hz) magnetic, the magnetic that can also improve in the above high-frequency domain of 400Hz also gradually becomes a kind of necessity can not only to improve in the past commercial frequency.

So far, about the improvement of the magneticflux-density and the iron loss of aforesaid non-oriented electromagnetic steel sheet having, all effort have been done.

For reducing the iron loss of non-oriented electromagnetic steel sheet having, the method that improves Si content is comparatively general, and the situation of for example having added the Si of about 3.5 quality % degree in the non-oriented electromagnetic steel sheet having of highest ranking is arranged.But along with the increase of Si content, magneticflux-density also is reduced when reducing iron loss really.

On the one hand, in low-grade non-directional steel plate, Si content Be Controlled, thus can obtain higher magneticflux-density, but have the very high problem of iron loss.

Iron loss improvement method as this low Si steel, open in the clear 62-267421 communique the spy, proposed in Si amount be below the 0.6 quality %, the Al amount is in the non-oriented electromagnetic steel sheet having of 0.15～0.60 quality %, limit the amount of the impurity of so-called C, S, N and O, the minimizing of the inclusion of the major cause that realization obstruction crystal grain is grown up and innoxious, promote crystal grain-growth, reach the technology of low iron lossization.But, because of reducing with intensity in the crystal grain-growth of these low Si steel, thus the limit of collapsing of the die cut surface when having Punching Technology, and burr is big, causes the significantly low inferior problem of die-cut property.

Moreover, improve the method for die-cut property as adjusting the hardness of hanging down the Si steel, the technology of the P that adds 0.08～0.1 quality % degree is arranged, for example open in the clear 56-130425 communique the spy, the technology that the P that adds less than 0.2 improves die-cut property is disclosed.In addition, as the technology of adding the P of low Si steel effectively, open in the flat 2-66138 communique the spy, disclose the Si amount has been controlled to below the 0.1 quality %, and add in the steel at the Al of the Al that contains 0.1～1.0 quality % scope, add the P of 0.1～0.25 quality %, improve the method for magnetic by the polymerization effect of Al and P.

But, in these technology,, only be aimed at the control of adjusting the limit of collapsing of steel plate with hardness, and do not carry out any consideration for the dimensional precision after die-cut according to the improvement of the die-cut property of adding P.

On the other hand, in the DC of embedded magnetictype brushless motor, viewpoint from high torqueization and miniaturization, require die-cut precision and high magnetic flux density, but and then, in order to be fit to the high speed rotating of rotor, or prevent the disengaging of the magnet that is embedded into, need keep the intensity of very high electro-magnetic steel plate.As describing, saw from the viewpoint of intensity that senior Si steel was also very favourable, but see from the viewpoint of magneticflux-density and wish to realize low Siization, intensity and magneticflux-density satisfactory to both parties always all very difficult.

Summary of the invention

As mentioned above, high magnetic flux density in non-oriented electromagnetic steel sheet having and low iron loss, it is desired common characteristic in whole purposes of non-oriented electromagnetic steel sheet havings such as various electric motor, transformer, especially as magnetic resistance motor type non-oriented electromagnetic steel sheet having blank, on its operating principle, especially high magnetic flux density and high dimensional accuracy become very important key element.

But, so far, have the good magnetic of so-called high magnetic flux density and low iron loss, and it is also undiscovered also to have a non-oriented electromagnetic steel sheet having of the dimensional precision of die-cut property in especially die-cut.In addition, and then outside these characteristics, satisfy the non-oriented electromagnetic steel sheet having of the middle requirement of strength that require such as DC brushless motor of embedded magnetictype, also undiscovered.

And then, except these magnetic and die-cut property, think that also the non-oriented electromagnetic steel sheet having of high speed rotatingization that can corresponding electric motor in recent years and the high frequencyization that multipolarization accompanies is also undiscovered.

The present invention is to develop at above-mentioned present situation, and its purpose is to have proposed the core material with electric motor and rotor etc., especially,

Have as the blank unshakable in one's determination of the special high magnetic flux density of magnetic resistance motor and high dimensional accuracy optimal, the magnetic balance of unprecedented high magnetic flux density-low iron loss, and the non-oriented electromagnetic steel sheet having that also has good die-cut dimensional precision, and,

The viewpoint that prevents from dispersing of the high speed rotating of high magnetic flux density and rotor and embedded magnet has the electro-magnetic steel plate of important high-strength characteristic and die-cut precision concurrently,

And favourable manufacture method.

Moreover, after, for convenience, Si and Al's and be the being called low Si steel more than about 0.03 quality %, below the 0.5 quality %, Si with Al's and above in being called of 0.5 quality %～high Si steel.

Present inventors, through being the conscientiously result of research who reaches above-mentioned purpose, thereby obtained allowing Si and the attenuating of Al amount it become on the basis of the very high steel of saturation magnetic flux density in itself for low Si grade of steel, the average crystallite particle diameter be adjusted in the fixed scope time, by adding an amount of P, the good magnetic of high track density and low iron loss not only can be obtained, the opinion of die-cut dimensional precision can also be improved extraordinarily.In addition, also obtained control with the scope of being aggregated in more than the 0.5 quality % of Si and Al～about 2.5 quality %, by adding an amount of P, significantly improve intensity with the state of keeping magneticflux-density when improving the effect of die-cut precision dimensional precision, can reach the opinion of unprecedented magnetic-strength balance.

The present invention is to be based on above-mentioned opinion.

That is, main idea structure of the present invention is as described below.

1. have the non-oriented electromagnetic steel sheet having of good magnetic and die-cut precision, it is characterized in that, contain by percentage to the quality,

C：0～0.010％

Si and/or Al: add up to more than 0.03%, below 0.5%,

Below the Mn:0.5%,

More than the P:0.10%, below 0.26%,

S:0.015% following and

Below the N:0.010%

Surplus partly is Fe and unavoidable impurities, and

Average crystallite particle diameter: more than the 30 μ m, below the 80 μ m.

2. according to the non-oriented electromagnetic steel sheet having described in above-mentioned 1, it is characterized in that with good magnetic and die-cut precision, steel plate and then, contain by percentage to the quality

Sb and/or Sn: add up to below 0.40%.

3. according to above-mentioned 1 or 2 described non-directional steel plates, it is characterized in that with good magnetic and die-cut precision, steel plate and then, contain by percentage to the quality

Below the Ni:2.3%.

4. according to above-mentioned 1,2 or 3 described non-directional steel plates, it is characterized in that the thickness of slab of steel plate is below the 0.35mm with good magnetic and die-cut precision.

5. magnetic properties, electro-magnetic steel plate that die-cut precision is good is characterized in that, contain by percentage to the quality

C：0～0.010％，

Si and/or Al: add up to 0.5 surpass～2.5%,

Below the Mn:0.5,

More than the P:0.10%, below 0.26%,

Below the S:0.015%,

N:0.010% following and, in case of necessity

Below the Ni:2.3%, and,

Satisfy indices P to represent in the following formula _A:

P _A＝-0.2×Si+0.12×Mn-0.32×Al+0.5×Ni ²+0.10×Ni+0.36……(1)

(wherein, the unit of each constituent content is quality %.In (2) formula too)

And the pass between P content is,

P≤P _A，

Perhaps, the indices P to represent in the following formula _F:

P _F＝-0.34×Si+0.20×Mn-0.54×Al+0.24×Ni ²+0.28×Ni+0.76…(2)，

P _F≤0.26

In one,

The surplus part is made of Fe and unavoidable impurities.

6. according to 5 above-mentioned described non-directional steel plates, it is characterized in that with good intensity, magnetic and die-cut precision, steel plate and then, contain by percentage to the quality

Sb and/or Sn: add up to below 0.40%.

Moreover, in above steel grade,, also can contain at least a that Ca:0.01% is following, B:0.005% is following, Cr:0.1% is following, Cu:0.1% is following, Mo:0.1% is following as the accessory element that contains.

7. the manufacture method of the non-directional steel plate of magnetic and die-cut precision, it is characterized by, for the steel billet that constitutes by above-mentioned 1～3 each described composition, hot rolling, in Heating temperature is the austenite one phase territory, and the coiled material coiling temperature is to carry out in the condition below 650 ℃, then scale handle after, after carrying out 1 time or containing cold rolling more than 2 times of process annealing, in the single-phase territory of the ferrite more than 700 ℃, carry out final annealing.

8. the manufacture method of the non-directional steel plate of magnetic and die-cut precision, it is characterized by, for the steel plate that constitutes by above-mentioned 1～3 each described composition, hot rolling, in Heating temperature is the austenite one phase territory, and the coiled material coiling temperature is after carrying out in the condition below 650 ℃, hot-rolled sheet annealing, when Ni content is 0% (do not have and add)～1.0 quality %, at single-phase territory of the ferrite more than 900 ℃ or Ac ₃Carry out in the austenite one phase territory more than the point, Ni content is above 1.0 quality %, when 2.3 quality % are following, at Ac on the other hand ₃Point carries out in the above austenite one phase territory, then scale handle after, after carrying out 1 time or containing cold rolling more than 2 times of process annealing, in the single-phase territory of the ferrite more than 700 ℃, carry out final annealing.

9. the manufacture method that has the non-directional steel plate of good intensity, magnetic and die-cut precision, it is characterized by, steel billet for above-mentioned 5 or 6, the hot rolling Heating temperature is 1000 ℃～1200 ℃, the hot rolling reeling temperature is to carry out hot rolling in the temperature below 650 ℃, then scale handle after, after carrying out 1 time or containing cold rolling more than 2 times of process annealing, carry out final annealing.

Moreover, in the manufacture method of electro-magnetic steel plate, also can after hot rolling, carry out hot-rolled sheet annealing above-mentioned 9.

In addition, in the manufacture method of the electro-magnetic steel plate of each in above-mentioned 7,8 or 9, can behind final annealing, form the processing of insulating coating.

Description of drawings

The chart of the Si content that Fig. 1 concerns between yield strength and die-cut diameter for expression relates to and the influence of P content.

The chart of the Si content that Fig. 2 concerns between yield strength and die-cut anisotropy for expression relates to and the influence of P content.

The chart of the Si content that Fig. 3 concerns between average crystallite particle diameter and die-cut diameter for expression relates to and the influence of P content.

The chart of the Si content that Fig. 4 concerns between average crystallite particle diameter and die-cut anisotropy for expression relates to and the influence of P content.

The chart of the Si content that Fig. 5 concerns between average crystallite particle diameter and iron loss for expression relates to and the influence of P content.

The chart of the Si content that Fig. 6 concerns between average crystallite particle diameter and magneticflux-density for expression relates to and the influence of P content.

The chart of the Si content that Fig. 7 concerns between iron loss and magneticflux-density for expression relates to and the influence of P content.

Fig. 8 relates to the chart of the influence of Si content that laminar crack produces and P content for expression.

Fig. 9 relates to the chart of the influence of Si content that laminar crack produces and Ni content for expression.

Si content that Figure 10 concerns between P content and die-cut diameter for expression relates to and the chart that adds the influence of Ni.

Si content that Figure 11 concerns between P content and die-cut anisotropy for expression relates to and the chart that adds the influence of Ni.

Figure 12 relates to the chart of the influence of the P content that concerns between tensile strength and magneticflux-density for expression.

The chart of Figure 13 for concerning between expression thickness of slab and high frequency iron loss.

The chart of Figure 14 for concerning between expression thickness of slab and magneticflux-density.

Embodiment

Below, for causing experimental result of the present invention to describe.Moreover the % that one-tenth shown below is grouped into represents ' quality % '.

[experiment 1]

At first, be the composition of steel of clear and definite non-oriented electromagnetic steel sheet having and the relation between die-cut dimensional precision, with roughly certain composition of C:0.0016～0.0028%, Mn:0.20～0.22%, Al:0.0007～0.0014%, N:0.0012～0.0022% and Sb:0.03% as essentially consist, and in the laboratory, melted out P amount respectively and be decided to be 0.02%, Si amount steel in 0.03～1.49% range, and Si amount is decided to be 0.11%, and the steel of P amount in 0.02～0.29% range.Then,, behind 1100 ℃ of heating 60min, be hot-rolled down to thickness of slab with these steel: 2mm, carry out 2 hours the insulation of coiled material with 600 ℃ after, carry out naturally cooling.Then, with 900 ℃ after the annealing of the hot-rolled sheets in 6 seconds, pickling is cold-rolled to thickness of slab: behind the 0.5mm, carry out final annealing with 700～900 ℃ all temps, change the particle diameter of various recrystallizations.Thereafter, on this final annealing plate, coat average film thickness: the half organic insulation overlay film of 0.6 μ m is made the roast sample, is used for die-cut test.

Moreover, the average crystallite particle diameter be observe parallel with rolling direction, thickness of slab direction cross section, and the diameter of equivalent circle of trying to achieve according to the Jeffries method.

Die-cut test, adopt diameter: the circular metal mould of 21mm φ carries out, and the gap is 8% of a thickness of slab.Measure 4 directions that become 0 °, 45 °, 90 °, 135 ° angle with rolling direction, die-cut round diameter (internal diameter), when obtaining its mean diameter of 4, maximum diameter in measuring at 4 and path poor is as die-cut anisotropic index.

With the result of gained, the relation table of putting out the yield strength of obtaining with the stretching experiment sheet (No. 5, JIS) that cuts out according to rolling direction (YP) in order is shown Fig. 1, Fig. 2.

By clearly learning among Fig. 1,2, whole, the soft material that YP is low, very big for the difference in the die-cut footpath of metal pattern diameter, along with the metal pattern size is approached in the die-cut footpath of the rising of YP, dimensional precision has the tendency of improvement.Can think that this is as in the past, the effect of the collapse-deformation when suppressing die-cut because intensity rises.

But, it should be noted at this, carry out the test portion that intensity is adjusted by the interpolation of P, the electro-magnetic steel plate of the type in the past that intensity changes comparatively speaking with the variation of Si amount, in with the intensity level of degree, also can show good dimensional precision, and also can Be Controlled (Fig. 1) with the difference in size of metal pattern in low YP territory.

In addition, changed the steel of Si amount, just followed die-cut diameter that intensity rises near metal pattern, and as shown in Figure 2, maximum diameter is still very big with the anisotropy that difference showed of path.To this, increase the steel that reaches the intensity rising by the P amount, the anisotropy of die-cut shapes also has been enhanced.

With these relation arrangements for the relation in the average crystal grain footpath of final annealing plate, be Fig. 3, Fig. 4.

Clearly learn by Fig. 3,4, changed the steel of Si amount, if particle diameter becomes big die-cut dimensional precision and die-cut anisotropy can worsen, add the steel of the P more than 0.13% with respect to this, even crystal grain directly becomes big die-cut dimensional precision and die-cut anisotropic also can be on good horizontal.

Contain a certain amount of above P and effectively improve die-cut dimensional precision and die-cut anisotropic reason by making, its detailed content is not quite clear and definite, still,

(1) rise by adding P intensity, the effect that the collapse-deformation when die-cut is alleviated,

(2) known by an amount of interpolation is the P of EMBRITTLEMENT ELEMENTS for steel, has quickened the effect of the breaking limit when die-cut, and

(3) have in the structure organization of the final annealing that the interpolation by P causes 100}＜uvw〉tendency that increases of orientation, think that this is by alleviating the result of comprehensive action such as anisotropic effect.

Then, the result from the research of magnetic aspect is described.

Inventors, Si by doing one's utmost to limit the reduction saturation magnetic flux density of improving iron loss and the content of Al, with the steel of high magnetic flux density as blank, for creating conditions and the relation of magnetic is carried out detailed research.

Among Fig. 5, represent thickness of slab for each steel: the sample of 0.5mm, investigate finally the withdraw from a secret society or underworld gang crystal grain diameter of plate and the iron loss (W in commercial frequency territory _15/50: the result of the relation the value that frequency 50Hz, peakflux density 1.5T are suitable).

By clearly learning among the figure, if be unfavorable for iron loss, but because of iron loss becomes greatly according to crystal grain diameter, just can stably become low iron loss so particle diameter become more than the 30 μ m so low Si will reduce resistance.In addition, when having confirmed to reduce resistance as low Al, too, it is effective that particle diameter is become more than about 30 μ m low iron lossization.

But, so far, as low Si of the present invention, Al constitute belong to low-grade non-oriented electromagnetic steel sheet having the time, the average crystallite particle diameter of final annealing plate is limited in 15～25 μ m degree usually.Its reason is, shown in the example of Fig. 3,4 0.11%Si-0.07%P steel (among the figure ● seal), and the significant cause if the deterioration that reduces the die-cut property that causes by intensity when making crystal grain-growth becomes.

In contrast, improve the steel of P addition,, also can keep good die-cut dimensional precision even the average crystallite particle diameter is become more than about 30 μ m.

Then, in Fig. 6, expression among this external Fig. 7, is then represented the result to the relational surveys between iron loss and magneticflux-density to average crystallite particle diameter in each steel and the relation between magneticflux-density.Here, B ₅₀Be the magneticflux-density among the magnetic force 5000A/m.

Add the test portion of Si, though it is very serious to improve the reduction of iron loss magneticflux-density.Comparatively speaking, add the test portion of P, the growth of crystal grain and iron loss also can be kept very high magneticflux-density after being enhanced.

But P is an EMBRITTLEMENT ELEMENTS, when the P addition is a lot of as the present invention, can produce in cold rolling process mainly that the limit is split and defective such as slabbing.Present inventors have conscientiously investigated this phenomenon, research and proved if the temperature in course of hot rolling during the heating base when ferrite/austenite coexistence territory, between ferrite grain and austenite grain, cause the distribution of P, the segregation of significant P takes place in the ferrite grain, and the embrittlement of steel is just by the promoted fact.For preventing this embrittlement phenomenon, in steel plate of the present invention is made, will be used for hot rolled base Heating temperature, it is very important becoming austenite one phase territory (perhaps as might be single-phase for ferrite).

Moreover, because of P is the ferrite forming element, thus the effect of near the austenite one phase territory of base Heating temperature being dwindled is arranged, but in the composition range of low Si steel, if the base Heating temperature just can become austenite one phase for 1000～1200 ℃.

It is as previously discussed, clear and definite that to add about P 0.1% or more in low Si steel be the very effective fact.Therefore, the method for also adding P in the steel plate that contains the Si more than 0.5% effectively has been discussed.

[experiment 2]

Melting is as the roughly stable composition of C:0.0013～0.0026, Mn:0.18～0.23%, Al:0.0001～0.0011%, N:0.0020～0.0029%, Si amount is changed to 0.60～2.42 and the P amount changed to 0.04～0.29% various steel, spend heating after 60 minutes with 1100, be hot-rolled down to thickness of slab 2mm, be cold-rolled to thickness of slab 0.50mm after the pickling.Its result, the lamellated fracture parallel with the plate face taken place in the steel plate inside according to being formed in of steel after rolling, taken place bad.Its result is expressed as Fig. 8.

The laminated fructure generating unit is divided according to after the EPMA transform analysis, and observing fracture generation part is the part of P segregation or denseization.So after studying the segregation condition of this P in great detail, learn in course of hot rolling, steel disc (base) when heating be as the condition of being held soaking in ferrite and austenite 2 phase regions mutually, thereby ferrite has been assigned with the fact of denseization of P in mutually.

That is, clear and definite in～high steel territory in because a lot of as Si, the Al amount of ferrite forming element, so the austenite one phase territory just dwindles more, its result becomes the problem of ferrite/austenite 2 phase regions easily in Heating temperature in the past.

In addition, P is if surpass 0.26%, and any structure condition also laminated fructure can take place.

Therefore, make of research equipment have various Si, Mn, the steel of Al, P amount, investigation is in being about 1000～1200 ℃ temperature field, the segregation that suppresses P makes the rolling bad condition that do not take place.Moreover, above-mentioned base Heating temperature, the viewpoint of separating out stabilization of the carbide nitride sulfide that exists from steel etc. sees it is the temperature that is well suited for.

At first, be under the condition in austenite one phase territory or the single-phase territory of ferrite in the base Heating temperature, owing to do not take place therefore to think its value of addition P as if being less than institute and quantitatively just can avoid laminated fructure by distributing the segregation that causes mutually.According to previous experiments, need become the addition of P about below 0.26%.

So at first, in the investigation～high Si steel becomes the condition of austenite one phase.

Its result, in the steel that contains more than 0.5% Si+Al, if the P addition,

P≤P _A', wherein

P _A’＝-0.2Si+0.12Mn-0.32Al+0.36……(1)’

(each content of Si, Mn, Al, P is expressed as quality %)

Scope the time, then in the austenite one phase territory.Therefore, satisfy above-mentioned condition, and be defined as P≤about 0.26%, can suppress the embrittlement that causes by P.

Then, in the investigation～high Si steel becomes the monophasic condition of ferrite, and is same, if the P addition,

P≤P _F', wherein

P _F’＝-0.34Si+0.20Mn-0.54Al+0.76……(2)’

During the scope of (each content of Si, Mn, Al, P is expressed as quality %) then in the single-phase territory of ferrite.Therefore, satisfy this condition, and be defined as P≤about 0.26%, also can suppress the embrittlement that causes by P.

Then, the base heating in austenite one phase territory or the single-phase territory of ferrite has been investigated the condition that suppresses the segregation of P at need.When the branch timing that produces P concentration in ferrite/austenite 2 phase regions, the P concentration of ferrite in mutually also becomes above-mentioned P _F', but the result of investigation demonstration, this P _F' become approximately below 0.26, can avoid the embrittlement that causes by P.

The embrittlement of putting in order in the 2 above-mentioned phase regions avoids the crisp fire in condition and the single-phase territory of ferrite to avoid condition, can reduce P≤about 0.26% and P _F'≤about 0.26.

Conclude above relation, avoid the condition of the embrittlement that causes by P, just become P≤about 0.26%, and, P≤P _A' or P _F'≤about 0.26.

According to above result, learn as if the P addition in about 0.26%, and in hot rolling when heating, is in the condition of austenite one phase or ferrite single-phase territory heating, can manufacture the defectives such as laminated fructure that do not have after cold rolling, and then, even also can make to the P of ferrite phase sendout in the condition of ferrite/austenite 2 heat phase low, the higher composition of Si, Al amount system.

And then, even also studied the various formations that near the base Heating temperature territory (1000～1200 ℃) of about P more than 0.1% when hot rolling becomes austenite or ferritic single phase structure steel of adding.

Its result is suitable for the interpolation of the Ni of the improvement of magnetic and the element that intensity is guaranteed, and the purpose near the austenite territory the expansion hot-rolled temperature in adding the P steel also is effective.

[experiment 3]

Roughly certain composition of having investigated with C:0.0013～0.0026%, Mn:0.18～0.23%, Al:0.0007～0.0013%, N:0.0014～0.0025% and P:0.16～0.18% is a basic comprising, the Si quantitative change be 0.95～2.44%, the sample of Ni quantitative change to 0～2.20%, with the experiment 2 the same 0.50mm that are calendered to, thus the situation occurred of the laminated fructure of the cold-rolled steel sheet that obtains.Its result is expressed as Fig. 9.

Do not have 1.1～1.5%Si steel of fracture when adding at Ni, the interpolation by Ni may become do not take place to rupture cold rolling.On the other hand, learn that having Ni does not have the situation that fracture takes place by the increase of Ni in the 1.95%Si steel of calendering when adding and the 2.4%Si steel yet, so also there is suitable territory in the effect of Ni.

Expand aforementioned formula if add the influence of Ni, learn that the P addition is about below 0.26% in containing the steel that is higher than 0.5% Si+Al, and, if

P≤P _A, wherein

P _A＝-0.2Si+0.12Mn-0.32Al+0.05Ni ²+0.10Ni+0.36……(1)

Scope the time, just 1000～1200 ℃ base Heating temperature in the austenite one phase territory, if

P _F≤ about 0.26, and

P _F=-0.34Si+0.20Mn-0.54Al+0.24Ni ²+ 0.28Ni+0.76≤P ... during (2) scope, even the embrittlement that can avoid P to cause is under any circumstance also reduced because of the denseization degree of P in the single-phase territory of 2 phase regions or ferrite.

Moreover in 2 above-mentioned formulas, each content of Si, Mn, Al, P, Ni is expressed as quality %.In addition, P _FAnd P _ATechnical meaning, with aforesaid P _F' and P _A' identical.

[experiment 4]

Roll cold-rolled steel sheet in 2 and 3 for experiment to 0.50mm, carry out final annealing after, coating average film thickness is the half organic insulation overlay film of 0.6 μ m, carries out roasting.To these samples, carry out die-cut test according to experiment 1 described method, investigate die-cut footpath and its anisotropy, its result is expressed as Figure 10 and Figure 11.According to these figure, even in containing the steel that is higher than 0.5% Si+Al, contain the steel of P 〉=0.10%, always present good die-cut dimensional precision.Here, in adding the Ni steel, addition changes between 0.38～2.20%.

And then the magneticflux-density B of these samples ₅₀Be shown in Figure 12 with the relation table of tensile strength TS.Here, TS equally tries to achieve by tension test with experiment 1, and magneticflux-density is also measured by the method for experiment 1.

Contain the steel of about P more than 0.1% with in the past in～electro-magnetic steel plate that high Si constitutes (being Si+Al＞0.5%) relatively presents good B ₅₀-TS balance.Especially the increase of along with P addition, TS increases but magneticflux-density may not be certain to reduce, and the tendency of rising is arranged on the contrary.This be because, the reinforcement of the steel plate of the interpolation by the alloying element beyond the strong magnetic body of the Si, the Al that carry out usually in the past electro-magnetic steel plate, than the reduction of magneticflux-density is a specific character together.

These characteristics are well suited for for the rotor blank of various whirlers (electric motor, generator) such as the DC brushless motor of the high torque (HT) miniaturized high-speed rotationization requirement that electric motor is arranged or magnetic resistance motor.

According to above opinion, as the good magneticflux-density of compatibility and the condition of die-cut dimensional precision, the Si in steel, Al, P, Ni amount, and then the average crystallite particle diameter of final annealing plate is defined as following scope during low Si steel.When hanging down the Si steel, a kind or 2 kinds the total of Si, Al: about 0.03～0.5%.

Si and Al have deoxidation effect if add in the steel, so use separately or jointly as reductor.For bringing into play its effect, need Si, Al separately separately or both totals be about more than 0.03%.In addition, resistivity is improved the effect of iron loss thereby Si, Al also have increase, but causes the reduction of saturation magnetic flux density on the other hand again, therefore its upper limit is defined as 0.5%.

In～during high Si steel, a kind or 2 kinds the total of Si, Al: 0.5% surpass～about 2.5%

When paying attention to good dimensional precision, when also paying attention to physical strength and low iron loss, the total amount of Si+Al can contain and surpass 0.5%.As previously mentioned, in～situation of high Si steel under, the effect of adding according to P, with among in the past the low P～high Si steel relatively, can obtain having high die-cut footpath degree and intensity-magneticflux-density equilibrated material.But, even the total amount of Si+Al is if surpass 2.5% by common cold rolling also very difficult of method of the present invention, thus be its scope dictates 0.5% surpass～about 2.5%.

P: about more than 0.10%, about below 0.26%

P is particularly important element in the present invention.P as known in the past certainly, has according to its high solid molten function of strengthening the adjustable whole timber material hardness of energy.Especially low Si, low Al steel plate were more soft originally, but in the present invention for low iron lossization need become median size more than about 30 μ m, so have the worry of the further softening of steel plate.P for the improvement of the die-cut property of steel plate of the present invention, and suppresses that pressure that the undercapacity by steel plate causes falls into and the increase of burr is essential elements.Except this strength of materials increases energy, by quickening the breaking limit when die-cut, the effect of the total deformation when suppressing die-cut, and increase in the structure organization of final annealing plate 100}＜uvw〉orientation, improve anisotropic effect, wait comprehensive action to improve die-cut dimensional precision.

In addition, although increase the intensity of steel plate but still have the characteristic that magneticflux-density does not reduce, this effect also bring into play in～high Si steel in.

For bringing into play these effects, need contain the P that has an appointment more than 0.10.On the one hand, P is an EMBRITTLEMENT ELEMENTS for steel originally, causes edge fracture and laminated fructure easily if add surplus, reduces manufacturing.For this point, in the present invention, by on manufacture method, working hard, or add Ni, can make the possibility that creates of adding steel at very difficult in the past high P.But content add steel even adopt manufacture method of the present invention also to be difficult to make P, so the P gauge is decided to be about scope of 0.10～about 0.26% if surpass approximately 0.26%.

Ni: about (can be used as selection adds) below 2.3%

Ni, not only has the effect that the structure organization that improves steel improves magneticflux-density, thereby also having the effect that the resistance that increases steel reduces iron loss concurrently, and the effect that falls into of the pressure when suppressing Punching Technology by the intensity that solution strengthening improves steel etc., therefore can add effectively.

In addition, Ni is an austenite former, therefore have expansion suitable base Heating temperature be 1000～1200 ℃ near the effect in austenite territory (the γ loop in the state graph).Especially, for Si+Al amount steel, effective to increasing operational stability more than 0.5% formation.If this effect of flexible Application, can improve the calendering unstable that produces when actively adding P as EMBRITTLEMENT ELEMENTS significantly as the present invention.That is, the P segregation of the surplus when the stable manufacturing place of Gao Gang is the control hot rolling is to avoid the base Heating temperature to become ferrite/austenite phase region as its effective ways.The total of Si content and Al content just is easy to be separated into 2 mutually in the base Heating temperature as if surpassing 0.5%, but enlarges effect according to the γ territory of Ni, in this Si, Al constitute, also can become austenite one phase when base heats.

But Ni content is if surpass approximately 2.3%, and ferrite (a) → austenite (γ) starting temperature of transformation reduces, and causes that in final annealing austenite phase transformation causes the worry of the reduction of magneticflux-density thereby therefore have.In addition, in low Si steel, be difficult to guarantee median size more than about 30 μ m with the cryogenic final annealing temperature below the transformation temperature, thereby iron loss will worsen also.Therefore, make that contained Ni is below 2.3%.Moreover, when adding Ni, add about more than 0.50% for well.

In low Si steel, the median size of final annealing plate: about 30 μ m are above, about 80m is following is to obtain good iron loss characteristic in low Si of the present invention, low Al non-oriented electromagnetic steel sheet having, as shown in Figure 5, need become the median size of final annealing plate more than about 30 μ m.But, improve effect even also can't expect to obtain this above iron loss as the particle diameter that surpasses about 80 μ m, belonging to the steel capital of the present invention in addition is that phase transformation steel and the single-phase territory of ferrite that is suitable for full annealed are roughly 700～900 ℃ scope, comparatively speaking the single-phase steel of ferrite that constitutes with high Si is low temperature, therefore overrun to make grain grow up on the productivity this point of short period of time annealing device continuously be disadvantageous, so 80 μ m as the upper limit.

Moreover, in～high Si steel in, by the upwards effect that has resistance according to alloy, obtain low iron loss easily, therefore constrained diameter painstakingly not can be common scope.Be generally 20～200 μ m degree.

Then, present inventors have studied for what produce along with the high speed rotatingization of electric motor and number of poles increase etc., are much accounted of the method for improving magnetic in high-frequency domain in recent years.Its result, it is effectively that thickness of slab lowers, especially its effect is particularly significant true in low Si steel.Below introduce the experiment of deriving its result.

[experiment 5]

Among Figure 13, represented the result who investigates for the thickness of slab dependency of 0.11%Si-0.18%P steel and 0.95%Si-0.02%P steel and the iron loss of 2.0%Si-0.5%Al steel in 400Hz.

As shown in the figure, each sample all reduces eddy-current loss according to the minimizing of thickness of slab as can be known, so high frequency iron loss has the tendency that is enhanced, and the high frequency iron loss that reduces according to thickness of slab improve the more remarkable of low Si steel in the effect.

But, the thickness of slab of non-oriented electromagnetic steel sheet having so far is main flow with 0.50mm, its above thickness of slab lowers the very high high-grade part of content that only is applicable to as the Si and the Al of resistivity element, the product example of not finding to have the content non-oriented electromagnetic steel sheet having seldom that is applicable to Si and Al.

In addition, among Figure 14, represented the result who investigates for the thickness of slab dependency of the magneticflux-density of these blanks.

As shown in the figure, if lower thickness of slab, though the tendency that has magneticflux-density to reduce a little, it is reduced to seldom, and in any thickness of slab, the item of low Si steel has especially high magneticflux-density.Especially for the purposes of driving motor of electric car (EV) and hybrid electric car (HEV) etc., work out the magnetic resistance motor of high speed rotating type, in such purposes, then the low iron loss in high magnetic flux density and the high frequency is much accounted of, but with respect to this, shown in the present can carry out alignment processing to the program of the very high steel plate attenuation of the magneticflux-density in essence of low Si, low Al.

As shown in figure 13, the effect that thickness of slab lowers is in that to become about 0.35mm remarkable when following, and it is more remarkable when following to be about 0.30mm.Moreover, thickness of slab, the thin more attenuating that helps eddy-current loss more, therefore the lower limit of thickness of slab is not set, but thereby the accumulative total increase in man-hour of magnetic core causes cost to uprise on the other hand, and also have the coincidence of stacked core to become disadvantages such as difficulty, so wish to be defined as the 0.10mm degree down when being provided in general production.

Below, describe for the qualification reason of the composition beyond the Si among the present invention, Al, P and the Ni.

C:0～about 0.010%

C is, by the effect of timeliness effect, after steel plate was made, passing in time worsened the element of magnetic (iron loss), and its degree is that C content is if surpassing about 0.010% just becomes significantly, so C content is limited in below 0.010%.Moreover about this timeliness degradation characteristic, the C amount is few more good more, is to have comprised that actual is the situation of zero (less than analyzing boundary value) for the C amount in the present invention therefore.

Mn: about below 0.5%

Mn, S be fixing as MnS, has the effect of the embrittlement in the hot rolling that inhibition causes by FeS.In addition, along with the increase of Mn content, increase resistivity and improve iron loss.But it on the other hand, and the increase of Mn content can cause the reduction of magneticflux-density, so being defined as about 0.5% on the Mn content.

S: about below 0.015%

S is that unavoidable impurities when separating out as FeS, not only becomes the brittle reason of hot rolling as mentioned above, worsens grain and grow up when refinement is separated out, so the viewpoint that lowers from iron loss lowers more favourable as far as possible.And the S amount significantly becomes big if surpass the deterioration part of about 0.015% iron loss, therefore will be defined as about 0.015% on it.But it on the other hand, and S also has the effect of improving the shear plane shape when die-cut, is to decide according to purposes so lower into which kind of degree.

N: about below 0.010%

N is, is the impurity of inevitably sneaking into, and when refinement is separated out as AlN, worsens the grain that hinders iron loss and grows up, and therefore is defined as about below 0.010%.

More than, be illustrated for neccessary composition and inhibition composition, but in the present invention, in addition, can suitably contain the element of the following stated as improving magnetic components.

Sb with and/or Sn: add up to about below 0.40%

Sb, Sn are crystal boundary partially, in the recrystallization process of steel by suppress from the crystal grain border { generation of the recrystallization nuclear in 111} orientation has the effect of improving magneticflux-density and iron loss.For obtaining this effect, use separately or and arbitrary situation of usefulness under all require to contain about 0.01% the amount that adds up to.Even so, superfluous its effect of content also can reach capacity, and content surpasses 0.40% fracture can produce cold and hot rolling after the embrittlement time on the contrary, thus use separately or and arbitrary situation of usefulness in all require to contain about amount below 0.40% that adds up to.

The other accessory element that contains is described.

In the present invention, as reductor, and the S that exists as impurity can be so that include Ca in about scope below 0.01% as the element of capturing effectively jointly with Mn.Oxidation, nitrogenize during in addition, for alleviation straightening annealing can be added about B, about Cr below 0.1% below 0.005%.

In addition, in addition, can not destroy effect of the present invention to elements such as well-known Cu, Mo as the element interpolation that does not destroy magnetic yet, but consider that from adding the cost aspect content of various elements is about below 0.1% better.

For other compositions, for example carbonitride forming elements such as Ti, Nb, V can allow to contain on a small quantity, but few situation helps keeping low iron loss.

Moreover, in～high Si in, as previously mentioned, in the base Heating temperature, composition is designed to austenite mutually or any single-phase of ferrite phase, or during austenite/ferritic 2 phase states, design denseization of the distribution amount that makes to the P of the ferrite phase of easy denseization of P and be suppressed, suppress the spot segregation of the surplus of P, can stably make high P and add steel.

Specifically, in the plate Heating temperature of separating out stabilization (about 1000～1200 ℃) of the carbide that suppresses to be suitable for existing in the steel, nitride, sulfide etc., the excessive spot segregation of P,

With the indices P of representing in the following formula _A:

P _A＝-0.2Si+0.12Mn-0.32Al+0.05Ni ²+0.10Ni+0.36……(1)

And the relation between P content, whether satisfy

P≤P _A, perhaps,

The indices P of in following formula, representing _F:

P _F＝-0.34Si+0.20Mn-0.54Al+0.24Ni ²+0.28Ni+0.76≤P…(2)

For

P _F≤ about 0.26

(unit of Si, Mn, Al, Ni, P is quality %)

Better.P here _ABe the experimental item of P content of obtaining in various Si, Mn, Al, Ni constitute the upper limit that is austenite one phase in about 1000～1200 ℃ temperature field, P _FBe the experimental item that becomes the P of the monophasic lower limit of ferrite content of obtaining.

Then, describe for of the present invention creating conditions.

Above-mentioned being adjusted into is fit to the molten steel that composition constitutes, after founding according to converter refining method or electric furnace fusion method etc., by connecting casting or agglomeration-piecemeal rolling process base.

Then, this base after the heating, is provided in the hot rolling calendering.At this, be the stabilization of separating out of the carbide that exists in the steel, nitride, sulfide etc., the base Heating temperature be about 1000～1200 ℃ for well.In addition, as previously mentioned, the phase state during the base heating is very important for the inhibition of the excessive spot segregation of P.

P is the ferrite forming element, therefore has the effect of dwindling near the austenite one phase territory of base Heating temperature, but is when hanging down the Si steel, in composition range of the present invention, if the base Heating temperature just can become austenite one phase for about 1000～1200 ℃.In being in addition～during high Si steel, if satisfy aforementioned P≤P _AComposition system, can in the base Heating temperature is about 1000～1200 ℃ scope, become austenite one phase.And then, central～as during high Si steel, to satisfy P _FWhen≤about 0.26 composition is, become ferrite/austenite coexistence territory, the segregation degree to the P of ferrite phase also only stays on the level that can avoid embrittlement.In addition, when in the single-phase territory of ferrite, heating,, P content just can not have a laminated fructure ground manufacturing with interior if being about 0.26%.

Coiled material coiling temperature after the hot rolling in the present invention, is an important factor of guaranteeing the manufacturing of high P steel.That is, if coiled material coiling temperature height generates iron phosphide (Fe in the coiled material cooling ₃P), reduce the bendability and the calenderability of hot-rolled sheet, it is about below 650 ℃ therefore requiring the coiled material coiling temperature, more preferably about below 600 ℃, and then more preferably about low temperature to try one's best below 550 ℃ batches.In addition, by being dipped in methods such as tank, or water spray, the method for quickening the cooling coiled material is also very effective with the coiled material after batching.

Then, coils of hot rolled after scaling by methods such as pickling, is provided to cold rolling calendering, but in order further to improve magnetic, also can carry out hot-rolled sheet annealing.

At this, the adding up to below 0.5% of Si content and Al content, in the low Si steel, the hot-rolled sheet annealing temperature is avoided ferrite/austenite coexistence territory (2 phase region) for well.This be because, in the annealing of 2 phase regions, be difficult to carry out crystal grain-growth, can not improve the cause of magnetic such as magneticflux-density.Below, describe for the hot-rolled sheet annealing temperature that is fit in the low Si steel with the different Ni amount.

When Ni do not have add steel or Ni amount be 1.0% below less Ni content is arranged the time, to non-oriented electromagnetic steel sheet having with closely often, the same when carrying out that hot-rolled sheet is annealed, can in the single-phase territory of about ferrite more than 900 ℃, anneal.In addition, also annealing temperature can be become more high temperature, can accomplish the austenite one phase territory (hope is 1050～1100 ℃ of degree) that the Ac3 point is above.Importantly avoid being the annealing in both phase regions of intermediate field (especially 950 ℃ near).

On the one hand, when Ni amount be 1.0～2.3% Ni content more for a long time, thereby reduce and in the annealing temperature of 900 ℃ of degree, also can become 2 phase regions because of the austenite in the annealing generates temperature, reduce magneticflux-density.Even so, because of the crystal grain-growth deficiency, can not obtain sufficient magneticflux-density in the annealing in the single-phase territory of the ferrite below 900 ℃.Therefore, the hot-rolled sheet annealing conditions in this one-tenth is analyzed is defined as the above austenite one phase territory (hope is 1050～1100 ℃ of degree) of Ac3 point.

Moreover, if in～foregoing particulate also obtains low iron loss easily during high Si steel, therefore the low Si steel of the crystal grain-growth in the annealing is important.Therefore, painstakingly do not limit the hot-rolled sheet annealing temperature, but normally in 700～1100 ℃ the scope for well.

Then, the coiled material that obtains after scaling, carries out 1 calendering, or accompanies the calendering of process annealing cold rolling (or warm-rolling) more than 2 times in the cold rolling or warm-rolling, finish fixed thickness of slab.

Then, carry out final annealing, but when low Si steel, this final annealing is carried out in the single-phase territory of the ferrite more than 700 ℃.Such reason is, if the final annealing temperature is difficult to stably median size be grown into more than about 30 μ m during less than 700 ℃, on the other hand when surpassing the single-phase territory of ferrite and generating austenite, structure organization will worsen, thereby causes the cause of the deterioration of magneticflux-density and iron loss.

Moreover, in～during high Si steel, the low Si steel of the crystal grain-growth in annealing is important as previously mentioned, does not therefore painstakingly limit the final annealing temperature, but normally in 700～1100 ℃ the scope for well.

Moreover, single-phase temperature field of the ferrite of hot-rolled sheet and cold-reduced sheet or austenite one phase temperature field, in advance the steel plate of Gou Chenging in all temps territory, heat-water-cooled and the tissue that obtains can observe by opticmicroscope etc. and determine.Perhaps, as additive method, can be according to Thermo-Calc ^TMDeng the computing mode figure that obtains of calculation of thermodynamics software, pre-estimate.

Behind the final annealing, the same with general non-oriented electromagnetic steel sheet having, can carry out the additional of insulating coating.Addition method painstakingly limits, but after the smearing of treated liquid, and carries out method that roast handles for well.

Moreover, the coiled material that obtains, carry out the cutting processing of required size, size after, become the Punching Technology of shape of motor stator and rotor there the user after, stacked, become product.Perhaps, as the case may be, die-cut after, carry out straightening annealing and (become product after being generally 750 ℃ * 1～2h).

(embodiment)

[embodiment 1]

Molten steel with the composition shown in the table 1 constitutes after the founding of laboratory, becomes thickness of slab by hot rolling: the plate of 30mm.Then, behind 1100 ℃ of heating 60min, be hot-rolled down to thickness of slab: 2mm, after keeping with 600 ℃ of suitable soaking of the coiled material that carries out 2h, carry out air cooling.Then, after 950 ℃ of hot-rolled sheet annealing of carrying out, after pickling, proceed to 0.50mm thick cold rolling (1 time cold rolling), in 700～900 ℃ all temps, carry out final annealing, the recrystallize particle diameter is changed into various values.Moreover when cold rolling, a lot of laminated fructures parallel with the plate face take place in the steel J that P content surpasses scope of the present invention in cold-rolled process, therefore stop following processing, do not estimate.

Moreover hot-rolled sheet annealing is not carried out in No.56～59 after hot rolling, but draws so that 2 cold-rolling practices that have process annealing concurrently are cold rolling in 800 ℃.

Then, the final annealing plate of making to gained is coated with average film thickness: the sample of the half organic insulation overlay film of 0.6 μ m provides and various tests.

Die-cut test, adopt diameter: the circular metal mould of 21mm φ and carrying out, the gap is 8% of a thickness of slab.Measure 4 directions that become 0 °, 45 °, 90 °, 135 ° angle with the pressure rolling direction, die-cut round diameter (internal diameter) is obtained its mean diameter of 4.In addition, maximum diameter in taking out at 4 and path poor is as die-cut anisotropic index.

Magnetic adopts the oblong-shaped test film that becomes 0 ° and 90 ° with rolling direction be cut into 180mm * 30mm, measures according to the Ai Busitanshi method.

Yielding stress (YP) uses the JIS5 test film that cuts abreast with rolling direction to carry out tension test with the condition of speed 10mm/min, adopts upper yield point.

The result is expressed as table 2 and table 3 with gained.

Table 1

The steel sequence number	Become to be grouped into (mass%)
										C	Si	Al	Mn	S	P	N	Sb	Sn
	A	0.0027	0.03	0.0008	0.21	0.0040	0.02	0.0015	0.030										＜0.001
B										0.0026	0.10	0.0008	0.22	0.0035	0.02	0.0020	0.032	＜0.001
	C	0.0019	0.53	0.0012	0.22	0.0023	0.02	0.0018	0.030										＜0.001
D										0.0019	0.95	0.0007	0.20	0.0033	0.02	0.0012	0.030	＜0.001
	E	0.0022	1.48	0.0014	0.21	0.0041	0.02	0.0022	0.033										＜0.001
F										0.0016	0.11	0.0015	0.20	0.0074	0.07	0.0019	0.030	＜0.001
	G	0.0017	0.11	0.0008	0.21	0.0036	0.13	0.0022	0.031										＜0.001
H										0.0023	0.11	0.0011	0.22	0.0022	0.18	0.0014	0.030	＜0.001
	I	0.0028	0.11	0.0006	0.22	0.0075	0.25	0.0018	0.031										＜0.001
J										0.0016	0.11	0.0014	0.21	0.0060	0.29	0.0016	0.032	＜0.001

Table 2

No.	The steel sequence number	Particle diameter (μ m)	B 50 (T)	W 15/50 (W/kg)	YP (MPa)	Die-cut diameter (mm)	Die-cut diameter Max-min (μ m)	Remarks
									1 2 3 4 5 6	A ″ ″ ″ ″ ″	11.3 20.5 28.2 31.9 42.8 61.3	1.818 1.811 1.807 1.804 1.797 1.785	9.79 6.85 5.90 5.45 5.09 4.62	311 243 214 204 182 160	20.979 20.963 20.959 20.957 20.952 20.950	17 21 28 29 25 34	Comparative example " " " " "
7 8 9 10 11 12	B ″ ″ ″ ″ ″	10.8 20.3 26.8 31.5 46.2 78.2	1.808 1.806 1.801 1.796 1.786 1.775	1023 6.85 5.99 5.52 4.94 4.50	322 249 223 210 183 152	20.981 20.968 20.961 20.959 20.954 20.945	16 14 18 19 23 26	Comparative example " " " " "
									13 14 15 16 17	C ″ ″ ″ ″	9.3 16.0 33.6 59.4 78.9	1.786 1.782 1.771 1.764 1.757	10.95 7.57 5.22 4.43 4.25	375 305 236 198 183	20.985 20.980 20.970 20.964 20.957	9 14 13 17 31	Comparative example " " " "
18 19 20 21 22 23	D ″ ″ ″ ″ ″	12.2 23.5 27.2 42.8 55.5 64.9	1.772 1.767 1.764 1.758 1.754 1.746	8.57 5.88 5.54 4.56 4.25 4.20	368 297 284 249 233 224	20.990 20.977 20.976 20.968 20.964 20.962	15 12 14 12 15 16	Comparative example " " " " "
									24 25 26 27 28	E ″ ″ ″ ″	18.2 26.8 31.7 45.6 66.8	1.755 1.752 1.749 1.741 1.726	6.48 5.20 4.68 4.18 3.90	361 324 310 284 261	20.990 20.986 20.983 20.980 20.976	16 15 13 14 17	Comparative example " " " "

Table 3

?No	The steel sequence number	Particle diameter (μ m)	B 50 (T)	W 15/50 (W/kg)	YP (MPa)	Die-cut diameter (mm)	Die-cut diameter Max-min (μ m)	Remarks
									?29 ?30 ?31 ?32 ?33	F ″ ″ ″ ″	8.6 26.5 33.4 52.0 59.7	1.813 1.811 1.809 1.802 1.797	11.80 5.99 5.45 4.77 4.75	377 246 227 196 188	20.989 20.975 20.973 20.966 20.960	7 11 10 14 16	Comparative example " " " "
?34 ?35 ?36 ?37 ?38 ?39	G ″ ″ ″ ″ ″	11.3 16.2 26.5 33.6 43.8 75.2	1.817 1.815 1.814 1.812 1.808 1.804	9.69 7.70 5.95 5.40 4.95 4.45	363 320 271 252 233 201	20.995 20.993 20.989 20.988 20.986 20.984	6 5 6 4 5 7	Comparative example " " example " "
									?40 ?41 ?42 ?43 ?44 ?45 ?46 ?47	H ″ ″ ″ ″ ″ ″	11.3 14.8 23.0 25.6 35.6 40.2 56.8 77.6	1.822 1.819 1.819 1.819 1.816 1.814 1.813 1.811	9.66 8.10 6.34 6.02 5.26 5.05 4.62 4.41	384 351 305 295 269 260 237 220	20.995 20.996 20.995 20.994 20.993 20.933 20.992 20.991	3 4 5 6 4 4 3 6	Comparative example " " " example " " "
?48 ?49 ?50 ?51 ?52 ?53 ?54	I ″ ″ ″ ″ ″ ″	10.8 13.5 26.8 32.5 40.8 56.4 60.5	1.826 1.824 1.821 1.820 1.818 1.817 1.816	9.93 8.55 5.77 5.15 4.94 4.59 4.53	420 391 321 305 288 267 263	20.994 20.995 20.996 20.994 20.993 20.994 20.992	3 4 5 4 5 4 4	Comparative example " " example " " "
									?55	J	Because cold rolling breaking is not estimated						Comparative example
?56 ?57	B ″	19.8 39.4	1.784 1.761	7.98 5.22	260 199	20.965 20.953	16 21	Comparative example "
									?58 ?59	H ″	18.2 35.6	1.795 1.816	7.81 5.26	335 269	20.993 20.993	6 4	The comparative example example

The suitable scope of the discontented unabridged version invention of P content, and and among the steel A～F (No.1～33,56,57) of change intensity according to the variation of Si amount and particle diameter, along with there is tendency near metal mold footpath in the die-cut footpath of the increase of YP, but the anisotropy of the die-cut size of representing with the difference of maximum diameter and path is that 10～20 μ m are bigger.In addition, if the Si amount increases the problem that magneticflux-density reduces that has.

With respect to this, as of the present invention, form the steel G～H that contains the P more than 0.10 as low Si, Al, following lower value also can form good die-cut footpath even YP is 350MPa, and the anisotropy of die-cut size is also very little.In addition, from the magnetic aspect, median size is controlled to be 30 μ m above (NO.37,38,39,44,45,46,47,51,52,53,54,59) and can both draws stable low iron loss and high magnetic flux density in these steel grades.

[embodiment 2]

The molten steel that composition shown in the table 4 is constituted after the founding of laboratory, becomes thickness of slab by the hot rolling identical with embodiment 1: behind the hot-rolled sheet of 3mm, with 1100 ℃ after the annealing of 30s hot-rolled sheet, after pickling, be cold-rolled to 0.50mm thickness.Then, carrying out final annealing more than 700 ℃ and in all temps in the single-phase territory of ferrite, be the recrystallize change of size various values.

Then, make and the embodiment 1 the same sample that scribbles half organic insulation overlay film, be provided in various tests.

The result of gained is expressed as table 5.

At this, steel K～M carries out deoxidation according to the Al that lowers Si, and the group of the group of steel N, O and steel Q, R is founded the state for the influence that can estimate the Ni interpolation.

Table 4

The steel sequence number	Become to be grouped into (mass%)
											C	Si	Al	Mn	S	Ni	P	N	Sb	Sn
	K	?0.0011	?0.01	?0.32	?0.25	?0.0032	-	0.05	0.0020	＜0.001											0.044
L											?0.0009	?0.01	?0.33	?0.24	?0.0039	-	0.16	0.0021	＜0.001	0.046
	M	?0.0019	?0.02	?0.31	?0.22	?0.0018	-	0.24	0.0024	＜0.001											＜0.001
N											?0.0033	?0.21	?0.23	?0.15	?0.0028	-	0.16	0.0012	0.060	＜0.001
	O	?0.0024	?0.21	?0.24	?0.18	?0.0016	1.23	0.16	0.0018	0.055											＜0.001
P											?0.0088	?0.35	?0.0011	?0.35	?0.0046	-	0.05	0.0031	＜0.001	＜0.001
	Q	?0.0082	?0.34	?0.0007	?0.33	?0.0040	-	0.19	0.0019	＜0.001											＜0.001
R											?0.0080	?0.35	?0.0011	?0.33	?0.0051	0.95	0.19	0.0018	＜0.001	＜0.001

Table 5

No	The steel sequence number	Particle diameter (μ m)	B 50 (T)	W 15/50 (W/kg)	YP (Mpa)	Die-cut diameter (mm)	Die-cut diameter Max-min (μ m)	Remarks
									1 2	K ″	36.1 61.3	1.777 1.769	4.95 4.27	211 177	20.959 20.950	18 26	The comparative example comparative example
3 4 5	L ″ ″	26.5 34.2 47.0	1.789 1.785 1.785	5.57 4.98 4.47	283 262 240	20.982 20.985 20.982	8 7 9	Comparative example example example
									6 7 8	M ″	12.5 35.2 70.2	1.777 1.774 1.768	8.63 4.88 4.06	396 294 250	20.995 20.991 20.992	6 8 9	Comparative example example example
9 10 11	N ″ ″	28.7 36.2 58.1	1.786 1.785 1.779	5.38 4.89 4.26	289 270 239	20.990 20.989 20.989	8 9 9	Comparative example example example
									12 13 14 15	O ″ ″ ″	6.8 22.7 32.1 48.2	1.807 1.803 1.803 1.797	12.96 5.28 4.37 3.70	484 329 299 270	20.995 20.992 20.992 20.995	2 2 3 7	Comparative example comparative example example example
16 17 18	P ″ ″	43.0 60.4 72.0	1.768 1.766 1.769	4.88 4.50 4.38	218 197 187	20.966 20.959 20.961	16 18 21	Comparative example comparative example comparative example
									19 20 21	Q ″ ″	18.4 44.8 75.1	1.766 1.766 1.775	6.99 4.76 4.29	348 273 243	20.987 20.977 20.984	7 8 8	Comparative example example example
22 23 24	R ″ ″	22.6 39.7 56.8	1.778 1.784 1.781	5.07 3.75 3.30	359 313 290	20.990 20.992 20.991	4 5 5	Comparative example example example

Satisfy steel of the present invention and constitute, and the median size equilibrium is turned to item more than the 30 μ m, all have good die-cut dimensional precision, and not only die-cut anisotropy diminishes, magnetic is also very good.Especially, difference comparative steel N and steel O and steel Q and steel R, confirming has significantly improving of magneticflux-density in steel O that adds Ni and steel R.

[embodiment 3]

With the molten steel of forming shown in the steel N of the steel F of table 1, table 4 and the steel O, after the founding of laboratory, become thickness of slab by the hot rolling identical with embodiment 1: behind the hot-rolled sheet of 2mm, with 1100 ℃ after the annealing of 30s hot-rolled sheet, after pickling, by the cold rolling all thickness of finishing 0.50～0.2mm.Then, carrying out final annealing more than 700 ℃ and in all temps in the single-phase territory of ferrite, the recrystallize particle diameter is controlled between 35～45 μ m.

Then, make and the embodiment 1 the same sample that scribbles half organic insulation overlay film, be provided in various tests.In addition, investigated the high frequency iron loss among the 400Hz for these samples.

The result of gained is double to be remembered in table 6.

Table 6

No.	The steel sequence number	Thickness of slab (mm)	Particle diameter (μ m)	B 50 (T)	W 15/50 (W/kg)	W 15/400(W/kg)	?YP ?(MPa)	Die-cut diameter (mm)	Die-cut diameter Max-min (μ m)	Remarks
											1 2 3	F ″ ″	0.50 0.35 0.20	38.2 37.1 42.8	1.807 1.804 1.803	4.84 3.78 3.41	171 98 58	217 219 209	20.968 20.983 20.989	14 12 11	Comparative example " "
4 5 6	N ″ ″	0.50 0.35 0.20	42.0 37.9 41.3	1.785 1.783 1.783	4.48 3.39 3.08	141 71 42	259 267 261	20.988 20.993 20.995	8 7 5	Example " "
											7 8 9	O ″ ″	0.50 0.35 0.20	37.4 43.5 35.2	1.802 1.797 1.798	3.86 3.05 2.78	89 48 29	288 277 292	20.992 20.995 20.995	4 3 4	Example " "

Along with the thickness of slab attenuation, especially the improvement of the iron loss in high frequency tendency is very remarkable.In addition, die-cut dimensional precision also has the tendency of improving with the thickness of slab attenuating, but the steel N, the O that satisfy composition range of the present invention are more better than comparative steel F.And then steel of the present invention is arbitrary thickness, is good in the anisotropy of die-cut size.

[embodiment 4]

Molten steel with the composition shown in the table 7 constitutes after the founding of laboratory, carries out the soaking of 1150 ℃ * 1 time, becomes the thickness of slab thin slab by hot rolling then.

With the thin slab of gained, be heated to temperature as shown in table 8 (SRT) and keep being hot-rolled down to 2.0mm after 1 hour, carry out the processing of the coiled material correspondence of 580 ℃ * 1 time, carry out air cooling.Then, remove a part of steel, carry out hot-rolled sheet annealing according to condition as shown in table 8.Then, after pickling, be cold-rolled to 0.50mm.

When cold rolling, according to the situation of the plate in cold rolling and cold rolling after the result that observes of section structure, estimate the processibility when cold rolling.The steel (W, Z, a, c, d, k and 1) of the composition range of high P (〉=0.10%) and the invention of discontented unabridged version, and, though composition range satisfies the present invention, but in base Heating temperature (SRT) or hot rolling reeling temperature (CT) item (No.25,26) beyond the scope of the invention, observe a lot of fractures that is parallel to the plate face, be separated into stratiform in a part of sample (No.5,19,25) in the pressure stretch process, it is very difficult that later calendering becomes.According to these results, be difficult to carry out the stable manufacturing in the industry, therefore these samples are not carried out later processing and evaluation.

Then, after carrying out final annealing with all temps more than 700 ℃ on the cold-reduced sheet, coat the half organic insulation overlay film identical with embodiment after, be provided in various tests.Here intensity and pressure stretch direction are cut No. 5 test films of JIS abreast, stretch with draw speed 10mm/s, estimate with the tensile strength (TS) of gained.The result and remember in table 8.

Table 7

Steel No	Steel is formed	C ％	Si ％	Al ％	Mn ％	S ％	Ni ％	P ％	N ％	Sb ％	Sn ％	P A	P A≥P	P F	P VS 0.26	The judged result of formula
																	S	Comparative steel	?0.0018	?0.60	?0.0010	?0.18	?0.0041	?0.00	?0.05	?0.0022	＜0.001	＜0.001	?0.261	?OK	?0.591	?NG	OK
T	The invention steel	?0.0011	?0.60	?0.0011	?0.19	?0.0033	?0.00	?0.13	?0.0032	＜0.001	＜0.001	?0.262	?OK	?0.593	?NG	OK
																	U	The invention steel	?0.0014	?0.60	?0.0006	?0.22	?0.0028	?0.00	?0.19	?0.0015	＜0.001	＜0.001	?0.266	?OK	?0.600	?NG	OK
V	The invention steel	?0.0032	?0.60	?0.0005	?0.18	?0.0032	?0.00	?0.26	?0.0018	＜0.001	＜0.001	?0.261	?OK	?0.592	?NG	OK
																	W	Comparative steel	?0.0031	?0.63	?0.0006	?0.19	?0.0041	?0.00	?0.29	?0.0021	＜0.001	＜0.001	?0.257	?NG	?0.585	?NG	NG
X	Comparative steel	?0.0011	?1.02	?0.0010	?0.19	?0.0032	?0.00	?0.04	?0.0018	＜0.001	0.023	?0.178	?OK	?0.451	?NG	OK
																	Y	The invention steel	?0.0011	?1.00	?0.0011	?0.21	?0.0032	?0.00	?0.15	?0.0020	＜0.001	0.036	?0.185	?OK	?0.461	?NG	OK
Z	Comparative steel	?0.0011	?0.98	?0.0004	?0.19	?0.0032	?0.00	?0.21	?0.0022	＜0.001	0.025	?0.187	?NG	?0.465	?NG	NG
																	a	Comparative steel	?0.0011	?1.01	?0.0006	?0.18	?0.0032	?0.00	?0.25	?0.0025	＜0.001	0.032	?0.179	?NG	?0.452	?NG	NG
b	Comparative steel	?0.0019	?1.52	?0.0009	?0.20	?0.0050	?0.00	?0.04	?0.0019	0.018	0.002	?0.080	?OK	?0.283	?NG	OK
																	c	Comparative steel	?0.0025	?1.54	?0.0011	?0.19	?0.0041	?0.00	?0.12	?0.0012	0.022	＜0.001	?0.074	?NG	?0.274	?NG	NG
d	Comparative steel	?0.0016	?1.48	?0.0008	?0.22	?0.0028	?0.00	?0.17	?0.0031	0.023	＜0.001	?0.090	?NG	?0.300	?NG	NG
																	e	The invention steel	?0.0018	?1.63	?0.0007	?0.18	?0.0019	?0.00	?0.19	?0.0026	0.019	＜0.001	?0.056	?NG	?0.242	?OK	OK
f	The invention steel	?0.0024	?1.60	?0.0006	?0.18	?0.0032	?0.00	?0.25	?0.0014	0.022	＜0.001	?0.061	?NG	?0.252	?OK	OK
																	g	Comparative steel	?0.0008	?2.18	?0.25	?0.20	?0.0008	?0.00	?0.03	?0.0018	＜0.001	0.035	?-0.132	?NG	?-0.076	?OK	OK
h	The invention steel	?0.0011	?2.20	?0.26	?0.18	?0.0004	?0.00	?0.13	?0.0022	0.002	0.036	?-0.142	?NG	?-0.092	?OK	OK
																	i	The invention steel	?0.0016	?2.11	?0.25	?0.18	?0.0013	?0.00	?0.10	?0.0021	＜0.001	0.034	?-0.120	?NG	?-0.056	?OK	OK
j	The invention steel	?0.0017	?2.08	?0.27	?0.19	?0.0017	?0.00	?0.24	?0.0035	＜0.001	0.032	?-0.120	?NG	?-0.055	?OK	OK
																	k	Comparative steel	?0.0024	?2.11	?0.27	?0.22	?0.0023	?0.00	?0.29	?0.0028	＜0.001	0.035	?-0.122	?NG	?-0.059	?OK	OK
l	Comparative steel	?0.0026	?1.50	?0.0010	?0.20	?0.0032	?0.50	?0.18	?0.0026	＜0.001	0.022	?0.146	?NG	?0.489	?NG	NG
																	m	The invention steel	?0.0033	?1.45	?0.0005	?0.19	?0.0015	?1.09	?0.16	?0.0021	0.002	0.021	?0.261	?OK	?0.894	?NG	OK
n	The invention steel	?0.0036	?1.56	?0.0010	?0.19	?0.0032	?1.57	?0.17	?0.0019	＜0.001	0.021	?0.351	?OK	?1.296	?NG	OK
																	o	The invention steel	?0.0098	?1.50	?0.0006	?0.21	?0.0022	?2.13	?0.19	?0.0025	＜0.001	0.026	?0.525	?OK	?1.978	?NG	OK

Table 8

No	Steel No	Steel is formed	Remarks	SRT (C°)	CT (C *)	Heat is pricked plate annealing temperature (C °)	B50 (T)	YP (MPa)	TS (MPa)	Die-cut diameter (mm)	Die-cut diameter max-min (μ m)	Manufacturing could	P A	?P A≥P	P F	?P V≤ ?0.26
																	1	S	Comparative steel	Comparative example	1150	520	900	1.775	227	348	?20.969	16	○	0.261	OK	0.591	?NG
2	T	The invention steel	Example	1150	520	900	1.774	260	382	?20.988	5	○	0.262	OK	0.593	?NG
																	3	U	The invention steel	Example	1150	520	900	1.776	286	410	?20.991	6	○	0.266	OK	0.600	?NG
4	V	The invention steel	Example	1150	520	900	1.777	315	439	?20.993	5	○	0.261	OK	0.592	?NG
																	5	W	Comparative steel	Comparative example	1150	520	900	-	-	-	?-	-	Laminated fructure	0.257	NG	0.585	?NG
6	X	Comparative steel	Comparative example	1150	550	900	1.762	255	370	?20.968	12	○	0.178	OK	0.451	?NG
																	7	Y	The invention steel	Example	1150	550	900	1.764	297	415	?20.992	5	○	0.185	OK	0.461	?NG
8	Z	Comparative steel	Comparative example	1150	550	900	-	-	-	?-	-	Laminated fructure	0.187	NG	0.465	?NG
																	9	a	Comparative steel	Comparative example	1150	550	900	-	-	-	?-	-	Laminated fructure	0.179	NG	0.452	?NG
10	b	Comparative steel	Comparative example	1150	550	1100	1.733	291	400	?20.974	15	○	0.080	OK	0.283	?NG
																	11	c	Comparative steel	Comparative example	1150	550	1100	-	-	-	?-	-	Laminated fructure	0.074	NG	0.274	?NG
12	d	Comparative steel	Comparative example	1150	550	1100	-	-	-	?-	-	Laminated fructure	0.090	NG	0.300	?NG
																	13	e	The invention steel	Example	1150	550	1100	1.735	360	470	?20.993	4	○	0.056	NG	0.242	?OK
14	f	The invention steel	Example	1150	550	1100	1.733	383	494	?20.992	3	○	0.061	NG	0.252	?OK
																	15	g	Comparative steel	Comparative example	1150	580	1000	1.703	938	444	?20.990	15	○	-0.132	NG	-0.076	?OK
16	h	The invention steel	Example	1150	560	1000	1.708	382	469	?20.995	5	○	-0.142	NG	-0.092	?OK
																	17	i	The invention steel	Example	1150	580	1000	1.709	400	509	?20.996	3	○	-0.120	NG	-0.056	?OK
18	j	The invention steel	Example	1150	580	1000	1.704	419	530	?20.994	3	○	-0.120	NG	-0.055	?OK
																	19	k	Comparative steel	Comparative example	1150	580	1000	-	-	-	?-	-	Laminated fructure	-0.122	NG	-0.059	?OK
20	l	Comparative steel	Comparative example	1150	550	1100	-	-	-	?-	-	Laminated fructure	0.146	NG	0.489	?NG
																	21	m	The invention steel	Example	1150	550	1100	1.742	353	465	?20.996	3	○	0.261	OK	0.894	?NG
22	n	The invention steel	Example	1150	550	1100	1.748	372	483	?20.995	4	○	0.351	OK	1.296	?NG
																	23	o	The invention steel	Example	1150	550	1100	1.751	383	495	?20.996	4	○	0.525	OK	1.978	?NG
24	Y	The invention steel	Example	1100	550	なし	1.754	312	416	?20.990	6	○	0.185	OK	0.461	?NG
																	25	Y	The invention steel	Comparative example	1250	550	550	-	-	-	?-	-	Laminated fructure	0.185	OK	0.461	?NG
26	Y	The invention steel	Comparative example	1150	700	700	-	-	-	?-	-	Laminated fructure	0.185	OK	0.461	?NG

As the composition of the scope of the invention, especially add in the steel (2～4,7,13,14,16～18 and 21～24) of the P more than 0.1%, all shown good die-cut dimensional precision.Just the P addition do not satisfy 0.1% steel (NO.1,6,10 and 15) though in can see the tendency that die-cut diameter improves along with the increase of Si+Al amount, the anisotropy of die-cut diameter is very big.On the one hand, the anisotropy that clear and definite steel drift of the present invention is cut diameter and die-cut diameter is good jointly.And then very high intensity has good intensity-magneticflux-density balance although these invention steel has that P content does not satisfy 0.1% the identical above magneticflux-density of comparative steel.

[embodiment 5]

The molten steel of the formation shown in the steel M of table 4, steel N and the steel O, under lab found? after being cast into, become thickness of slab: the thin slab of 30mm by hot rolling.Then, heating was hot-rolled down to thickness of slab after 60 minutes in each temperature (SRT) shown in the table 9: 2mm, in table institute's 9 each temperature (CT) of showing, carry out 1 hour soaking maintenance of coiled material correspondence after, carry out air cooling.Then, remove a part of steel, in each temperature shown in the table 9, carry out 60 seconds hot-rolled sheet annealing.

For the hot-rolled steel sheet of gained, in room temperature (23 ℃), carry out pliability test.Pliability test by the rolling test film of vertically taking 100mm * 30mm, is swept the pliability test of the 15mm bending radius of carrying out repeatedly according to JIS-C2550 from hot-rolled sheet.Frequency table before the hot-rolled sheet surface produces be full of cracks is shown table 9.

In addition, during the base heating, the tissue (phase) when annealing by following method investigation hot-rolled sheet.Thin slab, and hot-rolled sheet all are to keep institute's (base heating: 1 hour, annealing of fixing time at institute's fixed temperature (described in the table 9) respectively; 60 seconds) after, enter the tissue of water quenching when freezing to heat, by the structure observation of opticmicroscope, identified phase.The result is expressed as table 9.

Above-mentioned hot-rolled sheet proceeds to 0.50mm thick cold rolling (1 time cold rolling) after pickling, estimated whether cold rolling bad (laminated fructure) that embrittlement causes takes place.For the cold-reduced sheet that laminated fructure does not take place, in all temps as shown in table 9, carry out final annealing, then, make the sample scribble the half organic insulation overlay film identical with embodiment 1, be provided in various tests.

The result be expressed as table 9.

Table 9

?No	Steel No	Steel is formed	Remarks	SRT (C°)	Carefully knitting during the base heating	CT (C°)	Hot-rolled sheet annealing temperature (C °)	Heat is pricked the plate annealed structure	The hot-rolled sheet number of bends	Manufacturing could	Final annealing temperature (C °)	Particle diameter (μ m)	B50 (T)	W15/50 (W/kg)	YP (MPa)
																1	?M	The invention steel	Comparative example	1250	α+γ	520	Do not have	-	4	Laminated fructure	-	-	-	-	-
2	?M	The invention steel	Example	1150	γ 1Single-phase	520	Do not have	-	30	○	800	46.2	1.765	4.47	275
																3	?M	The invention steel	Example	1050	γ is single-phase	520	Do not have	-	28	○	800	38.2	1.762	4.75	288
4	?M	The invention steel	Comparative example	950	α+γ	520	Do not have	-	5	Laminated fructure	-	-	-	-	-
																5	?M	The invention steel	Comparative example	1150	γ is single-phase	720	900	α is single-phase	3	Bendability reduces	850	45.1	1.762	6.83	288
6	?N	The invention steel	Example	1150	γ is single-phase	620	900	α is single-phase	17	○	850	55.2	1.764	4.31	242
																7	?N	The invention steel	Comparative example	1150	γ is single-phase	550	960	α+γ	20	○	850	53.8	1.736	4.33	244
8	?N	The invention steel	Example	1150	γ is single-phase	550	1100	γ is single-phase	22	○	850	52.1	1.768	4.36	246
																9	?N	The invention steel	Comparative example	1150	γ is single-phase	500	900	α is single-phase	27	○	670	16.0	1.766	7.38	345
10	?O	The invention steel	Example	1100	γ is single-phase	600	1100	γ is single-phase	26	○	800	36.5	1.777	4.12	290
																11	?O	The invention steel	Example	1100	γ is single-phase	600	1000	γ is single-phase	33	○	800	38.5	1.780	4.02	286
12	?O	The invention steel	Comparative example	1100	γ is single-phase	550	900	α+γ	28	○	800	32.6	1.733	4.34	298
																13	?O	The invention steel	Comparative example	1100	γ is single-phase	550	800	α is single-phase	24	○	800	36.8	1.739	4.10	289

Form in (low Si steel) at steel of the present invention, when satisfying of the present invention creating conditions (No.2,3,6,8,10 and 11), although be that high P adds, but still manufacturing steel plate that can be without a doubt, performance is also good.

The opposing party learns to cause that by embrittlement bad easy generation is cold rolling bad when base Heating temperature of the present invention becomes 2 phase regions (No.1 and 4) that the commercialization meeting is very difficult.In addition, when the coiled material coiling temperature was higher than 650 ℃ (No.5), the processibility of hot-rolled sheet reduced, and the iron loss of the electro-magnetic steel plate of gained also reduces.And then, when the hot-rolled sheet annealing temperature becomes 2 phase regions (No.7 and 12), and, in the steel that has added more than the Ni of 1.0 quality %, in the single-phase territory of α, carry out hot-rolled sheet when degenerating (No.3), the magneticflux-density of the electro-magnetic steel plate of gained can reduce.And further, the final annealing temperature becomes 30 μ m inadequate situation (No.9) when above to the recrystallize particle diameter outside of the present invention creating conditions, and magnetic has also worsened.

The possibility of industrial utilization

Like this, according to the present invention, can stably obtain to have the excellent magnetic of high magnetic flux density and low iron loss, and the non-oriented electromagnetic steel sheet having with high die-cut dimensional accuracy, and have more high-intensity non-oriented electromagnetic steel sheet having.

And, non-oriented electromagnetic steel sheet having of the present invention, the blank unshakable in one's determination that is suitable for various motor, the magnetic resistance motor that wherein especially together is required as high dimensional accuracy and high magnetic flux density, and and then require the blank unshakable in one's determination of brushless motor etc. of embedded magnet type of green strength the most suitable.

Claims (13)

1. a non-oriented electromagnetic steel sheet having is characterized in that, contain by percentage to the quality,

C：0～0.010％，

Si and Al at least a kind: add up to more than 0.03%, below 0.5%,

Below the Mn:0.5%,

More than the P:0.10%, below 0.26%,

S:0.015% following and

Below the N:0.010%,

Surplus partly is Fe and unavoidable impurities, and

Average crystallite particle diameter: more than the 30 μ m, below the 80 μ m.

2. non-oriented electromagnetic steel sheet having according to claim 1 is characterized in that, steel plate and then, contain by percentage to the quality,

Sb and Sn at least a kind: add up to below 0.40%.

3. non-oriented electromagnetic steel sheet having according to claim 1 is characterized in that, steel plate and then, contain by percentage to the quality,

Below the Ni:2.3%.

4. non-oriented electromagnetic steel sheet having according to claim 2 is characterized in that, steel plate and then, contain by percentage to the quality,

Below the Ni:2.3%.

5. according to each the described non-oriented electromagnetic steel sheet having in the claim 1～4, it is characterized in that, steel plate and then, contain by percentage to the quality,

Ca:0.01% is following, B:0.005% is following,

Cr:0.1% is following, Cu:0.1% is following,

Below the Mo:0.1%

In at least a.

6. according to each the described non-oriented electromagnetic steel sheet having in the claim 1～4, it is characterized in that the thickness of slab of steel plate is below the 0.35mm.

7. non-oriented electromagnetic steel sheet having according to claim 5 is characterized in that, the thickness of slab of steel plate is below the 0.35mm.

8. the manufacture method of non-oriented electromagnetic steel sheet having is characterized in that, for have with claim 1～4 in the steel billet formed of each described steel plate identical component,

In the austenite one phase territory, and the coiled material coiling temperature carries out hot rolling in the condition below 650 ℃ in Heating temperature,

Then scale handle after, after carrying out 1 time or containing cold rolling more than 2 times of process annealing, in the single-phase territory of the ferrite more than 700 ℃, carry out final annealing.

9. the manufacture method of non-oriented electromagnetic steel sheet having is characterized in that, for have with claim 1～4 in the steel billet formed of each described steel plate identical component,

In Heating temperature in the austenite one phase territory, and the coiled material coiling temperature carries out hot rolling in the condition below 650 ℃ after,

When Ni does not have interpolation, or Ni content is 1.0 quality % when following, carries out hot-rolled sheet annealing in any temperature in single-phase territory of the ferrite more than 900 ℃ or the austenite one phase territory more than the Ac3 point,

When Ni content surpasses 1.0 quality %, when 2.3 quality % are following, carry out hot-rolled sheet in the austenite one phase territory more than Ac3 point and anneal,

Then scale handle after, after carrying out 1 time or containing cold rolling more than 2 times of process annealing,

In the single-phase territory of above ferrite, carry out final annealing at 700 ℃.

10. the manufacture method of non-oriented electromagnetic steel sheet having is characterized in that, for containing by percentage to the quality,

C：0～0.010％，

Among Si and the Al at least a kind: add up to surpass 0.5, below 2.5%,

Below the Mn:0.5%,

More than the P:0.10%, below 0.26%,

Below the S:0.015%,

N:0.010% following and,

In case of necessity below the Ni:2.3%,

Surplus partly is Fe and unavoidable impurities, and satisfies,

P≤P _AAnd P _FThe steel billet of the relation of at least one aspect in≤0.26,

1000～1200 ℃ of Heating temperatures, and the coiled material coiling temperature carries out hot rolling in the condition below 650 ℃ after, carry out hot-rolled sheet annealing, or do not carry out hot-rolled sheet annealing,

Then scale handle after, after carrying out 1 time or containing cold rolling more than 2 times of process annealing,

Carry out final annealing,

Wherein,

P _A＝-0.2Si+0.12Mn-0.32Al+0.05Ni ²+0.10Ni+0.36......(1)

P _F＝-0.34Si+0.20Mn-0.54Al+0.24Ni ²+0.28Ni+0.76......(2)

Here, the unit of each constituent content is quality %.

11. the manufacture method of non-oriented electromagnetic steel sheet having according to claim 10 is characterized in that, steel billet and then, contain by percentage to the quality,

Sb and Sn at least a kind: add up to below 0.40%.

12. the manufacture method of non-oriented electromagnetic steel sheet having according to claim 10 is characterized in that, steel billet and then, contain by percentage to the quality,

Ca:0.01% is following, B:0.005% is following,

Cr:0.1% is following, Cu:0.1% is following,

Below the Mo:0.1%

In at least a.

13. the manufacture method according to each described non-oriented electromagnetic steel sheet having in the claim 10～12 is characterized in that, making the coiled material coiling temperature is below 600 ℃.

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